A "nominal platform" is a named place where NPC's can stand. This class makes it easy to arrange for an NPC to be described as standing in a particular location in the room: for example, we could have an actor "standing in a doorway", or "leaning against the streetlamp."

In most cases, a nominal platform is a "secret" object, in that it won't be listed in a room's contents and it won't have any vocabulary words. So, the player will never be able to refer to the object in a command.

To use this class, instantiate it with an object located in the room containing the pseudo-platform. Don't give the object any vocabulary words. Locate actors within the pseudo-platform to give them the special description.

For simple platform-like "standing on" descriptions, just define the name. For descriptions like "standing in", "standing under", or "standing near", where only the preposition needs to be customized, define the name and define actorInPrep. For more elaborate customizations, such as "leaning against the streetlamp", you'll need to override roomActorHereDesc, roomActorStatus, roomActorPostureDesc, roomListActorPosture, and actorInGroupPrefix/Suffix,